n. ledge
misc. circular bead
比例阀阀芯具有比较宽的边缘带有槽口的台肩。
A proportional valve spool therefore has wider lands with notches cut into the edges.
双台肩钻具接头可大幅度提高钻具的抗扭强度。
The torsional strength of the drilling tools can be greatly increased by using the double shoulder tool joint.
根据零件图试制双台肩钻具接头，对其进行上卸扣试验和水压密封测试。
We manufacture the tool joint, make the seal test and make-and-break test.
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